/*
 * Copyright 2012 Gregor Schauer
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package at.schauer.gregor.vienna.datastore.file;

import at.schauer.gregor.vienna.context.ViennaContext;
import at.schauer.gregor.vienna.datastore.StorageMetadata;
import at.schauer.gregor.vienna.exception.ViennaException;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.SerializationUtils;

import java.io.*;

/**
 * @author Gregor Schauer
 */
public class ObjectOutputFileDataStore<T extends Serializable> extends AbstractFileDataStore<T> {
	public ObjectOutputFileDataStore(ViennaContext ctx, File rootDirectory, String ext) {
		super(ctx, rootDirectory, ext);
	}

	@Override
	@SuppressWarnings("unchecked")
	public <E extends T> E read(File file, StorageMetadata<E> metadata) {
		FileInputStream in = null;
		try {
			in = new FileInputStream(file);
			return (E) SerializationUtils.deserialize(in);
		} catch (FileNotFoundException e) {
			throw new ViennaException(e);
		} finally {
			IOUtils.closeQuietly(in);
		}
	}

	@Override
	public void write(File file, StorageMetadata<T> metadata) {
		FileOutputStream out = null;
		try {
			out = new FileOutputStream(file);
			SerializationUtils.serialize(metadata.object, out);
		} catch (FileNotFoundException e) {
			throw new ViennaException(e);
		} finally {
			IOUtils.closeQuietly(out);
		}
	}
}
